Chris S M Turney
Dados Biográficos
| ID | 2738693 |
|---|---|
| NOME | Chris S M Turney |
| PRENOMES | Chris S M |
| SOBRENOME | Turney |
| ASSINATURA | TURNEY C S M |
| AFILIAÇÕES | Palaeontology, Geobiology and Earth Archives Research Centre, University of New South Wales, Sydney, NSW 2052, Australia |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 16 |
| TOTAL DE CITAÇÕES | 21 |
| TOTAL COMO AUTOR | 16 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1997 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2023 |
| ÍNDICE H | 3 |
The Accuracy and Precision of Small-Sized Modern Wood Samples Analyzed at the Chronos 14 Carbon-Cycle Facility
Tree-ring series offer considerable potential for the development of environment-sensitive proxy records. However, with traditional increment cores, only small amounts of wood are often available from annual tree-ring sequences. For this reason, it is important to understand the reliability (and reproducibility) of radiocarbon measurements obtained from small-sized samples. Here we report the F 14 C results from the Chronos 14 Carbon-Cycle Facili…
The Influence of Calibration Curve Construction and Composition on the Accuracy and Precision of Radiocarbon Wiggle-Matching of Tree Rings, Illustrated by Southern Hemisphere Atmospheric Data Sets fro…
This research investigates two factors influencing the ability of tree-ring data to provide accurate 14 C calibration information: the fitness and rigor of the statistical model used to combine the data into a curve; and the accuracy, precision and reproducibility of the component 14 C data sets. It presents a new Bayesian spline method for calibration curve construction and tests it on extant and new Southern Hemisphere (SH) data sets (also exam…
Investigating Subantarctic 14 C Ages of Different Peat Components
Precise radiocarbon ( 14 C) dating of sedimentary sequences is important for developing robust chronologies of environmental change, but sampling of suitable components can be challenging in highly dynamic landscapes. Here we investigate radiocarbon determinations of different peat size fractions from six peat sites, representing a range of geomorphological contexts on the South Atlantic subantarctic islands of the Falklands and South Georgia. To…
When did Homo sapiens first reach Southeast Asia and Sahul?
Anatomically modern humans ( Homo sapiens , AMH) began spreading across Eurasia from Africa and adjacent Southwest Asia about 50,000–55,000 years ago ( ca . 50–55 ka). Some have argued that human genetic, fossil, and archaeological data indicate one or more prior dispersals, possibly as early as 120 ka. A recently reported age estimate of 65 ka for Madjedbebe, an archaeological site in northern Sahul (Pleistocene Australia–New Guinea), if correct…
Potential for tree rings to reveal spatial patterns of past drought variability across western Australia
Proxy records have provided major insights into the variability of past climates over long timescales. However, for much of the Southern Hemisphere, the ability to identify spatial patterns of past climatic variability is constrained by the sparse distribution of proxy records. This is particularly true for mainland Australia, where relatively few proxy records are located. Here, we (1) assess the potential to use existing proxy records in the Au…
Anomalous mid-twentieth century atmospheric circulation change over the South Atlantic compared to the last 6000 years
Determining the timing and impact of anthropogenic climate change in data-sparse regions is a considerable challenge. Arguably, nowhere is this more difficult than the Antarctic Peninsula and the subantarctic South Atlantic where observational records are relatively short but where high rates of warming have been experienced since records began. Here we interrogate recently developed monthly-resolved observational datasets from the Falkland Islan…
Extreme wet conditions coincident with Bronze Age abandonment of upland areas in Britain
Synchronisation of palaeoenvironmental records over the last 60,000 years, and an extended Intimate event stratigraphy to 48,000 b2k
Geochemical characterization of Quaternary tephras from the Campanian Province, Italy
Does the El Niño–Southern Oscillation control the interhemispheric radiocarbon offset?
Since the 1970s it has been recognised that Southern Hemisphere samples have a lower radiocarbon content than contemporaneous material in the Northern Hemisphere. This interhemispheric radiocarbon offset has traditionally been considered to be the result of a greater surface area in the southern ocean and high-latitude deepwater formation. This is despite the fact that the El Niño–Southern Oscillation (ENSO) is known to play a significant role in…
Robust Radiocarbon Dating of Wood Samples by High-Sensitivity Liquid Scintillation Spectroscopy in the 50–70 kyr Age Range
Although high-sensitivity liquid scintillation (LS) spectroscopy is theoretically capable of producing finite radiocarbon ages in the 50,000- to 70,000-yr range, there is little evidence in the literature that meaningful dates in this time period have been obtained. The pressing need to undertake calibration beyond 26 kyr has resulted in the regular publication of 14 C results in excess of 50 kyr, yet very little effort has been made to demonstra…
Towards a Radiocarbon Calibration for Oxygen Isotope Stage 3 Using New Zealand Kauri ( Agathis Australis )
It is well known that radiocarbon years do not directly equate to calendar time. As a result, considerable effort has been devoted to generating a decadally resolved calibration curve for the Holocene and latter part of the last termination. A calibration curve that can be unambiguously attributed to changes in atmospheric 14 C content has not, however, been generated beyond 26 kyr cal BP, despite the urgent need to rigorously test climatic, envi…
Late-glacial and Holocene vegetation and climatic history of the Cass Basin, central South Island, New Zealand
Lithology, pollen, macrofossils, and stable carbon isotopes from an intermontane basin bog site in southern New Zealand provide a detailed late-glacial and early Holocene vegetation and climate record. Glacial retreat occurred before 17,000 cal yr B.P., and tundra-like grassland"shrubland occupied the basin shortly after. Between 16,500 and 14,600 cal yr B.P., a minor regional expansion of forest patches occurred in response to warming, but the b…
Early Human Occupation at Devil's Lair, Southwestern Australia 50,000 Years Ago
New dating confirms that people occupied the Australian continent before the earliest time inferred from conventional radiocarbon analysis. Many of the new ages were obtained by accelerator mass spectrometry 14 C dating after an acid–base–acid pretreatment with bulk combustion (ABA-BC) or after a newly developed acid–base–wet oxidation pretreatment with stepped combustion (ABOX-SC). The samples (charcoal) came from the earliest occupation levels …
Implications for the Dating of Wisconsinan (Weichselian) Late-Glacial Events of Systematic Radiocarbon Age Differences between Terrestrial Plant Macrofossils from a Site in SW Ireland
AMS radiocarbon dates were obtained from Salix herbacea leaves, Carex seeds, and bulk organic detritus from a lake sediment profile of Wisconsinan (Weichselian) Lateglacial age in SW Ireland. There is a systematic age difference between the dated series from the two types of macrofossils, with ages obtained from Salix herbacea leaves being 900 to 1500 14 C years younger than those obtained from Carex seeds. The latter tend to be more in accord wi…
Carbon Isotope Variations and Chronology of the Last Glacial-Interglacial Transition (14–9 ka BP)
We present δ 13 C data from both bulk organic sediment samples and terrestrial plant macrofossils from five high-resolution sedimentary sequences from the United Kingdom from which extensive multiproxy data sets have been obtained. These span the last glacial-interglacial transition. Chronological control has been provided by radiocarbon dating and/or tephrochronology. The results demonstrate that significant shifts in bulk organic δ 13 C can be …
Towards a Radiocarbon Calibration for Oxygen Isotope Stage 3 Using New Zealand Kauri ( Agathis Australis )
It is well known that radiocarbon years do not directly equate to calendar time. As a result, considerable effort has been devoted to generating a decadally resolved calibration curve for the Holocene and latter part of the last termination. A calibration curve that can be unambiguously attributed to changes in atmospheric 14 C content has not, however, been generated beyond 26 kyr cal BP, despite the urgent need to rigorously test climatic, envi…
Robust Radiocarbon Dating of Wood Samples by High-Sensitivity Liquid Scintillation Spectroscopy in the 50–70 kyr Age Range
Although high-sensitivity liquid scintillation (LS) spectroscopy is theoretically capable of producing finite radiocarbon ages in the 50,000- to 70,000-yr range, there is little evidence in the literature that meaningful dates in this time period have been obtained. The pressing need to undertake calibration beyond 26 kyr has resulted in the regular publication of 14 C results in excess of 50 kyr, yet very little effort has been made to demonstra…
Investigating Subantarctic 14 C Ages of Different Peat Components
Precise radiocarbon ( 14 C) dating of sedimentary sequences is important for developing robust chronologies of environmental change, but sampling of suitable components can be challenging in highly dynamic landscapes. Here we investigate radiocarbon determinations of different peat size fractions from six peat sites, representing a range of geomorphological contexts on the South Atlantic subantarctic islands of the Falklands and South Georgia. To…
Extreme wet conditions coincident with Bronze Age abandonment of upland areas in Britain
Carbon Isotope Variations and Chronology of the Last Glacial-Interglacial Transition (14–9 ka BP)
We present δ 13 C data from both bulk organic sediment samples and terrestrial plant macrofossils from five high-resolution sedimentary sequences from the United Kingdom from which extensive multiproxy data sets have been obtained. These span the last glacial-interglacial transition. Chronological control has been provided by radiocarbon dating and/or tephrochronology. The results demonstrate that significant shifts in bulk organic δ 13 C can be …
Implications for the Dating of Wisconsinan (Weichselian) Late-Glacial Events of Systematic Radiocarbon Age Differences between Terrestrial Plant Macrofossils from a Site in SW Ireland
AMS radiocarbon dates were obtained from Salix herbacea leaves, Carex seeds, and bulk organic detritus from a lake sediment profile of Wisconsinan (Weichselian) Lateglacial age in SW Ireland. There is a systematic age difference between the dated series from the two types of macrofossils, with ages obtained from Salix herbacea leaves being 900 to 1500 14 C years younger than those obtained from Carex seeds. The latter tend to be more in accord wi…
Early Human Occupation at Devil's Lair, Southwestern Australia 50,000 Years Ago
New dating confirms that people occupied the Australian continent before the earliest time inferred from conventional radiocarbon analysis. Many of the new ages were obtained by accelerator mass spectrometry 14 C dating after an acid–base–acid pretreatment with bulk combustion (ABA-BC) or after a newly developed acid–base–wet oxidation pretreatment with stepped combustion (ABOX-SC). The samples (charcoal) came from the earliest occupation levels …
Late-glacial and Holocene vegetation and climatic history of the Cass Basin, central South Island, New Zealand
Lithology, pollen, macrofossils, and stable carbon isotopes from an intermontane basin bog site in southern New Zealand provide a detailed late-glacial and early Holocene vegetation and climate record. Glacial retreat occurred before 17,000 cal yr B.P., and tundra-like grassland"shrubland occupied the basin shortly after. Between 16,500 and 14,600 cal yr B.P., a minor regional expansion of forest patches occurred in response to warming, but the b…
Does the El Niño–Southern Oscillation control the interhemispheric radiocarbon offset?
Since the 1970s it has been recognised that Southern Hemisphere samples have a lower radiocarbon content than contemporaneous material in the Northern Hemisphere. This interhemispheric radiocarbon offset has traditionally been considered to be the result of a greater surface area in the southern ocean and high-latitude deepwater formation. This is despite the fact that the El Niño–Southern Oscillation (ENSO) is known to play a significant role in…
Robust Radiocarbon Dating of Wood Samples by High-Sensitivity Liquid Scintillation Spectroscopy in the 50–70 kyr Age Range
Although high-sensitivity liquid scintillation (LS) spectroscopy is theoretically capable of producing finite radiocarbon ages in the 50,000- to 70,000-yr range, there is little evidence in the literature that meaningful dates in this time period have been obtained. The pressing need to undertake calibration beyond 26 kyr has resulted in the regular publication of 14 C results in excess of 50 kyr, yet very little effort has been made to demonstra…
Towards a Radiocarbon Calibration for Oxygen Isotope Stage 3 Using New Zealand Kauri ( Agathis Australis )
It is well known that radiocarbon years do not directly equate to calendar time. As a result, considerable effort has been devoted to generating a decadally resolved calibration curve for the Holocene and latter part of the last termination. A calibration curve that can be unambiguously attributed to changes in atmospheric 14 C content has not, however, been generated beyond 26 kyr cal BP, despite the urgent need to rigorously test climatic, envi…
Geochemical characterization of Quaternary tephras from the Campanian Province, Italy
Synchronisation of palaeoenvironmental records over the last 60,000 years, and an extended Intimate event stratigraphy to 48,000 b2k
Anomalous mid-twentieth century atmospheric circulation change over the South Atlantic compared to the last 6000 years
Determining the timing and impact of anthropogenic climate change in data-sparse regions is a considerable challenge. Arguably, nowhere is this more difficult than the Antarctic Peninsula and the subantarctic South Atlantic where observational records are relatively short but where high rates of warming have been experienced since records began. Here we interrogate recently developed monthly-resolved observational datasets from the Falkland Islan…
Extreme wet conditions coincident with Bronze Age abandonment of upland areas in Britain
Potential for tree rings to reveal spatial patterns of past drought variability across western Australia
Proxy records have provided major insights into the variability of past climates over long timescales. However, for much of the Southern Hemisphere, the ability to identify spatial patterns of past climatic variability is constrained by the sparse distribution of proxy records. This is particularly true for mainland Australia, where relatively few proxy records are located. Here, we (1) assess the potential to use existing proxy records in the Au…
When did Homo sapiens first reach Southeast Asia and Sahul?
Anatomically modern humans ( Homo sapiens , AMH) began spreading across Eurasia from Africa and adjacent Southwest Asia about 50,000–55,000 years ago ( ca . 50–55 ka). Some have argued that human genetic, fossil, and archaeological data indicate one or more prior dispersals, possibly as early as 120 ka. A recently reported age estimate of 65 ka for Madjedbebe, an archaeological site in northern Sahul (Pleistocene Australia–New Guinea), if correct…
The Influence of Calibration Curve Construction and Composition on the Accuracy and Precision of Radiocarbon Wiggle-Matching of Tree Rings, Illustrated by Southern Hemisphere Atmospheric Data Sets fro…
This research investigates two factors influencing the ability of tree-ring data to provide accurate 14 C calibration information: the fitness and rigor of the statistical model used to combine the data into a curve; and the accuracy, precision and reproducibility of the component 14 C data sets. It presents a new Bayesian spline method for calibration curve construction and tests it on extant and new Southern Hemisphere (SH) data sets (also exam…
Investigating Subantarctic 14 C Ages of Different Peat Components
Precise radiocarbon ( 14 C) dating of sedimentary sequences is important for developing robust chronologies of environmental change, but sampling of suitable components can be challenging in highly dynamic landscapes. Here we investigate radiocarbon determinations of different peat size fractions from six peat sites, representing a range of geomorphological contexts on the South Atlantic subantarctic islands of the Falklands and South Georgia. To…
The Accuracy and Precision of Small-Sized Modern Wood Samples Analyzed at the Chronos 14 Carbon-Cycle Facility
Tree-ring series offer considerable potential for the development of environment-sensitive proxy records. However, with traditional increment cores, only small amounts of wood are often available from annual tree-ring sequences. For this reason, it is important to understand the reliability (and reproducibility) of radiocarbon measurements obtained from small-sized samples. Here we report the F 14 C results from the Chronos 14 Carbon-Cycle Facili…
Geology and Paleoclimatology Research (14 obras) · Geography (10 obras) · Geology (10 obras) · Radiocarbon dating (9 obras) · Archaeology (8 obras) · Archaeology and ancient environmental studies (7 obras) · Holocene (7 obras) · Paleontology (7 obras) · Physical geography (7 obras) · Pleistocene-Era Hominins and Archaeology (7 obras)